Investigation of structure and mechanical properties of multi-layer Al/AlN composite produced by accumulative roll bonding (ARB) process using nanosized AlN particles

Accumulative roll bonding (ARB) is one of the most applicable methods at the industrial production of ultrafine grained (UFG) materials with sheet form. In this work, by the accumulative roll bonding process at room temperature, Al/AlN substrates is produced successfully for the first time using Al strips and AlN nano-sized particles up to 6 cycles with different content of AlN. After optimum milling of the AlN particles by using of pearl-mill , Particle size analyzer and transmission electron microscopy (TEM) were utilized for evaluating powders. The bonding strength of multilayered substrate, which is tested by a mechanic testing equipment for all samples, reached more than 350 MPa for ARB products with 2% the nano-sized AlN particle. The microstructure of the production is investigated by scanning electron microscopy (SEM) and optical microscope. There is no reaction product in the interface of Al/AlN.

Keywords:

accumulative roll bonding , transmission electron microscopy , particle size analyzer , pearl-mill